Heel nailing device



M. DZIKI ET AL 3,238,546

HEEL NAILING DEVICE March 8, 1966 3 Sheets$heet 1 Filed Oct. 28, 1964 IN VENTORS.

M/ECZYSLAW DZIKI and GEORGE SCHULTZ TTORNEY.

March 8, 1966 M. DZlKl ET AL 3,238,546

HEEL NAILING DEVICE Filed Oct. 28, 1964 3 Sheets-Sheet 2 1 S MIECZYSLAW DZ/KI and GEORGE SCHULTZ ATTORNEY.

March 8, 1966 M. DZIKI ET AL 3,238,546

HEEL NAILING DEVICE Filed Oct. 28, 1964 3 Sheets-Sheet 5 llv 520 504 52| Sol 508 5240 5 4 SIG @ng I03 INVENTORS.

MIECZYSLAW DZIKI and GEORGE SCHULTZ ATTORNEY.

United States Patent 3,238,546 HEEL NAILING DEVICE Mieczysiaw Dziki, Dorchester, and George Schultz,

Newton Highlands, Mass., assignors to Industrial Shoe Machinery Corp., Roxbury, Mass., a corporation of Massachusetts Filed Oct. 28, 1964, Ser. No. 407,148 8 Claims. (Cl. 12-125) This invention relates to a nailing device. In particular it relates to a heel nailing device operated by pneumatic pressure.

In the manufacture of shoes, particularly womens shoes having high heels, it has often been desired to simplify the present complicated methods of nailing the heel to the shoes.

In mounting a heel on a shoe by nailing, it is a common practice to attach the heel to the lasted shoe by a single central initial nail and complete the nailing of the heel after removal of the shoe from the last. Devices for such temporary nailing steps have included means for driving a nail through a hole in the last. However, the devices described in the prior art have lacked one or more of a number of desired features, such as self-adjustment for varying heel heights, ease of control and efiectiveness in attaching the inner sole to the curved heel cup with the single nail.

One object of this invention is to provide a nailing machine for attaching heels which is simple to operate and reliable in performance.

Further objects and advantages of this invention will be apparent from the specification and claims which follow, taken together with the appended drawings where- FIG. 1 is a side view of one embodiment of this invention in partial section to show the connection of the various components and is in rest position.

FIG. 1A is a side view of the portion of the invention which actuates the nail.

FIG. 2 is a side view of the embodiment illustrated in FIGURES 1 and 1A in operative position.

FIG. 3 is a front elevation with partial section of the nailing portion before nailing.

FIG. 4 is a front elevation as in FIG. 3 but showing the operative or nailing position.

FIG. 5 is a partial front elevation of the nailing device in partial section showing the pneumatic position with the control pedal half way down.

FIG. 6 is a view as in FIG. 5 with the control pedal all the way down.

FIG. 7 is a view as in FIG. 5 with the control pedal just after release.

FIG. 8 is a schematic diagram of the arrangement of the pneumatic system.

The invention comprises generally a self-adjusting clamp for positioning the heel on the shoe upper mounted on the last and a high-velocity pneumatic nailing hammer arranged to drive a nail through a tube in the last into the heel by a single impact. The invention is characterized by the fact that contrary to devices of prior art the clamp is moved to the shoe, using fluid means, thus avoiding the loosening occasioned by movement of the unattached heel and adjusts itself for differences in heel heights. The invention is further characterized by superior control of the impact stroke and by a mean-s which ejects the shoe from the machine upon completion of the cycle of operation. One important feature of the invention is the single control for the sequence of clamping, nailing and ejection.

In the embodiment of the invention illustrated in the drawings, a frame 10 is shown supporting a clamp 20.

Patented Mar. 8, 1966 Also attached to the frame is a pneumatic hammer 30 of controllable stroke which is arranged to support a shoe 40 on its last. The clamp 20 is arranged to hold the heel 401 in proper position on the shoe 40 so that the hammer device 30 can apply a nail 307 through a hollow last pin 306 in the last 403 of the shoe 402. The pin 306 has a recessed shoulder 306a which allows its tip to go through the last bottom and touch the inner sole board adjacent the heel permitting pushing of the board into the hollowness of the heel. Heel hollowness is due to curvature forming what is also known as the heel cupt facing the inner sole. As the heel is clamped to the last shoe, the hollow last pin 306 extends through the last 403 so that the projection 306a (see FIG. 1A) extends through the last and actually contacts the inner sole pushing it into the curvature of the heel cup. This avoids the problem of the temporary nail in the prior art sticking out from the shoe when the permanent nails have forced the inner sole more tightly against the heel cup.

The adjustable heel clamp device 20 comprises a pneumatic cylinder 201 held in a bolt frame 202-203. The cylinder 201 is provided with a piston whose shaft 207 is connected to a pivot pin 250 connected on a lower bracket piece 209. Bracket piece 209 has a pin 224 which is slidable in the slot of connecting member 208. Connecting member 208 is pivotally mounted on pivot pin 226 which extends through a frame extension portion 229. The upper part of connecting member 208 has 3 holes selectively engageable with a pin 222 pivoting in a hole on an upper bracket member 210. As shown in FIG. 1, the pin 222 is engaged with the center of the three holes in the upper portion of member 208 and extends through the center of the three holes in the middle member 210.

The bracket member 209 terminates in a pair of forked rollers, namely a left roller 217 and a right roller 218 to hold the top of the heel against the shoe containing its last. The upper bracket member 210 is pivotally connected at 223 to a threadable rod 211 having a spring 212 and terminating in a pivot pocked 225 on lower bracket member 209. The upper bracket member 210 terminates in a pad 216 which is pivotally mounted for applying pressure against the bottom of the heel. The pad 216 is adjustable as to angle by means of bolt 214 in conjunction with spring 215 and also bolt 213 in conjunction with spring 221. The position of bracket member 210 can also be adjusted to accommodate various heel heights by means of bolt 211 in conjunction with spring 212. Further, the extent of arcuate motion of the assembly mounted on connecting member 208 can be adjusted by bolt 219 in conjunction with spring 220. Members 213221 and 214215 regulate the angle that pad 216 makes with member 210. This angle is set once for a particular style of heel and normally need not be changed for varying heel height. Threading of member 211-212 through pivotable member 223 serves to make one adjustment sufiicient for a range of heel heights. The machine is self-adjusting Within this range of heel heights. Member 219-220 serves as a limit of motion for member 208 and is fixed for a particular type of last. Accordingly, no adjustment for heel heights within a given range is needed and the clamp is essentially self-adjusting.

Motion of the piston rod 207 by means of the pressure applied to cylinder 203 as explained below, causes the clamping assembly to press down or rise up, according to the control. As explained below, a single foot pedal 103 is used to control the valves actuating the piston and cylinder 203 as well as the valves actuating the nailing device, which is equipped with its own air cylinder 30 1.

The high velocity, adjustable stroke nailing device or hammer 30 comprises a cylinder 301 provided with a piston 330 supported on a projection 102 of the frame 10.

The cylinder 301 contains a top plate 304 and a bottom plate 305. In the cylinder, piston 330' actuates' a ram rod 308 which drives the nail 307 through a hollow last pin 306 and int-o the heel 401. The initiation of impact is governed by the interaction of a retaining piece 365 which moves with the rod 312. The retaining piece 365 is held against rotatable balls 372 and 373 which project from side cylinders 370 and 37-1. There must be suflicient build up of pressure in cylinder 30 1 to overcome the resistance of balls 372 and 373 in order for the ram rod 308 to exercise its hammer action. The resistance of balls 372 and 373 is governed by air pressure applied to cylinders 370 and 371. Other adjustments for operation of the hammer includes a threaded dial 314 mounted on a support 33 1 and a spring 380 surrounding ram rod 308 between plate 317 and member 365. Turning of dial 314 permits sensitive control of the length of the impact drive.

The hammer construction illustrated comprises rods 350 and 351 havingnarrowed lower positions 352 and 353 respectively. Rod 350 is surrounded by a coil spring 354 and rod 351 is surrounded by coil spring 355. Rod 350 terminates in a top position 315 extending through plate 317. Likewise, rod 351 has a top extension 316 extending through plate 317. The rods 350 and 351 therefore extend between the dial 314 and a bottom assembly 365. Rods 358 and 359 extend through the bottom assembly 365 and are equipped with springs 360 and 361. Rods 358 and 359 have shoulders 3-56 and 357 to hold the springs.

The valve circuitry, which is illustrated schematically in FIG. 8 comprises a foot pedal 103 whose arm 104 first actuates in its half way position valves 527 and 528. Line 518 runs from valve 528 to a connection with valve 527 and then vi-a line 515 to regulator 520. Line 516 runs from regulator 520 to a T. One branch, 514 connects with regulator 525 whereas the other branch 517 connects with valve 529. Branch 513 leads from regulator 525 to a T, one branch being 512 connecting to regulator 5126. Air line pressure is supplied through line 511 to regulator 526. The other branch from 513 is pipe 509 leading to one side of a valve 522 connected with the hammer cylinder 30.

From valve 527 is a line 506 to a T wherein branch 505 connects to a valve 524 and branch 504 connects with a regulator 521. Regulator 521 connects to both of the ball cylinders 370 and 371 via pipes 503, 501 and 502.

Valve 524 is connected to the clamp cylinder 20 which in turn is also connected through valve 523 which has a line 507 running to valve 527. There is also a line 510 between hammer valve 522 and valve 529.

After the lasted shoe 402-403 is placed on the hollow last spindle 306, the positioned heel 401 is pressed against the shoe (FIG. 3) by action of the foot 110 on the foot pedal 103. This is a consecutive operation whereby clamp cylinder 20 is actuated first by removing force normally applied to valve 528 and then cylinder 30 is actuated (FIG. 4), causing the nail in the hollow last tube to be driven into the heel 401. It should be noted that depression half way of the foot pedal (FIG. 5) not only operates the clamping cylinder, but admits air into cylinders 3'10 and 371 which press against partially protruding balls 372 and 373. Further pressure on the foot pedal causes pressure to be built up in cylinder 30'1 behind piston 330 so as to force the piston rod'313 past the balls 372 and 373 and thus deliver an impact stroke againstv the nail 307 in the hollow last tube 306 (FIG. 6). When the control pedal is released (FIG. 7), clamping cylinder 201 releases more quickly than the impact cylinder 30 which bleeds slowly. This permits the clamp to disengage from the heel, but still have sufiicient compression of springs 360 and 361 so as to cause the ejector pins 310 and 311 to push the shoe and last up and away from the machine. 7

The pressure in the various cylinders depends on both the available line pressure and the density of the material from which the heels are constructed. As an example, the clamp and impact cylinder pressure could be about one hundred pounds per square inch while the ball mally expected with an ordinary pneumatic hammer oper-' ating at such line pressure.

We claim:

1. A pneumatic hammer comprising a source of air under pressure, a main cylinder provided with a piston moveable .in a longitudinal direction, two auxiliary cylinders for actuating a pair of spheres moveable transversely against the rod of said piston, and control means for admitting air to said auxiliary cylinders so as to exert pressure on said spheres and then admitting air to said cylinders suflicient to overcome the transverse pressure of said spheres and cause said piston rod to make an impact stroke.

2. A heel nailing device comprising in combination a frame, a pneumatic main cylinder mounted on said frame and provided With a piston moveable in a longitudinal direction, two auxiliary cylinders actuable on a pair of spheres moveable transversely against the rod of said piston, a hollow last pin having a recessed shoulder and adapted to both hold a nail and seat a last having a last hole cooperable with said shoulder, a clamp for holding a heel in position for nailing, and control means for admitting air to said auxiliary cylinders so as to exert pressure on said spheres and then admitting air to said cylinder sufiicient to overcome the transverse pressure of said spheres and cause said rod to drive said nail out of said hollow last pin.

3. A heel nailing device comprising in combination a frame, a pneumatic cylinder mounted on said frame, a piston moveable in said cylinder and having an impact member connected thereto, a pair of members normally urged into restraining engagement with said member by associated pressure means, a hollow last pin having a recessed shoulder for holding a lasted shoe upper having a heel hole therein accommodating said last pin shoulder, a clamp for holding a heel in position for nailing, and means for causing said member to move out of restraining engagement and deliver an impact stroke into said.

hollow last pin.

4. A heel nailing device comprising in combination: a frame, pneumatic driving means mounted on said frame and including a hollow last pin, said pin having a recessed shoulder and adapted to both contain a nail and seat a last having a hole through which said shoulder may protrude, power operated clamping means adapted to hold a heel in position for nailing against a shoe surrounding such a last, and control means for sequentially actuating said clamping power means and causing said pneumatic driving means to drive a nail out of said hollow last pin.

5. The device of claim 4 wherein spring loaded ejector pins are provided and wherein said control means provides a more rapid release of said clamping means than said.

pneumatic means so that said ejector pins move said last outwardly. a

6. A high velocity pneumatic hammer comprising a said rod, and a pair of transversely pressing members normally urged into restraining engagement with said impact member by fluid pressure means.

7. A heel clamping device comprising: a frame, a vertical member pivotally mounted on the frame, a first horizontal member pivotally mounted on an intermediate portion of said vertical member, a second horizontal member pivotally mounted on a portion of said vertical member beyond said first portion, and an adjustable pivotable link between said horizontal members; said first horizontal member having means for engaging the top lateral portion of a heel; said second horizontal member having means for pressing against the bottom of a heel; means being provided for pivoting one of said horizontal members.

8. The device of claim 7 wherein said latter means comprises fluid pressure means,

References Cited by the Examiner UNITED STATES PATENTS McKay l-44.4 Dean 12-13.1

Boynton 144.4 MacDonald 12-125 Leahy et al. 12125 Ackermann 12-125 Dell 227-153 Rogers 227153 FRANK I. COHEN, Primary Examiner.

15 JORDAN FRANKLIN, Examiner.

P. D. LAWSON, Assistant Examiner. 

7. A HEEL CLAMPING DEVICE COMPRISING: A FRAME, A VERTICAL MEMBER PIVOTALLY MOUNTED ON THE FRAME, A FIRST HORIZONTAL MEMBER PIVOTALLY MOUNTED ON AN INTERMEDIATE PORTION OF SAID VERTICAL MEMBER, A SECOND HORIZONTAL MEMBER PIVOTALLY MOUNTED ON A PORTION OF SAID VERTICAL MEMBER BEYOND SAID FIRST PORTION, AND AN ADJUSTABLE PIVOTABLE LINK BETWEEN SAID HORIZONTAL MEMBERS; SAID FIRST HORIZONTAL MEMBER HAVING MEANS FOR ENGAGING THE TOP LATERAL PORTION OF A HEEL; SAID SECOND HORIZONTAL MEMBER HAVING MEANS FOR PRESSING AGAINST THE BOTTOM OF A HEEL; MEANS BEING PROVIDED FOR PIVOTING ONE OF SAID HORIZONTAL MEMBERS. 